I really like this dreadful mood. I think it's not necessarily the world was always being unaffected, just we were following two people who had their own troubles. The world is big, and when you're left to live a way where all you can do is put one foot in front of the other, over and over....
I think that's a lot of the horror of this kind of setting. The feeling of the weight of all the little and big atrocities piling up, and I bet some of us still thought but if you get paid that much...
I think the smile of her mother might have been the scariest sight in this chapter. Kind of another sad reflection, here at the end. The things you do for love.
....I hope Yume's siblings are okay. Feels like the least Q could do is set up a trust.